title: Weak coupling magnetism in Ce4Pt12Sn25: a small exchange limit in the Doniach phase diagram.
abstract: Magnetic susceptibility, magnetization, specific heat, and electrical resistivity studies on single crystals of Ce4Pt12Sn25 reveal an antiferromagnetic transition at T(N) = 0.19 K, which develops from a paramagnetic state with a very large specific heat coefficient (C/T) of 14 J mol(-1) K(-2)-Ce just above T(N). On the basis of its crystal structure and these measurements, we argue that a weak magnetic exchange interaction in Ce4Pt12Sn25 is responsible for its low ordering temperature and a negligible Kondo-derived contribution to physical properties above T(N). The anomalous enhancement of specific heat above T(N) is suggested to be related, in part, to weak geometric frustration of f-moments in this compound.
authors.affiliation: Los Alamos National Laboratory, Los Alamos, NM 87545, USA.
authors.forename: Han-Oh
authors.initials: HO
authors.lastname: Lee
authors.forename: Nobuyuki
authors.initials: N
authors.lastname: Kurita
authors.forename: Pei-chun
authors.initials: PC
authors.lastname: Ho
authors.forename: Cathie L
authors.initials: CL
authors.lastname: Condron
authors.forename: Peter
authors.initials: P
authors.lastname: Klavins
authors.forename: Susan M
authors.initials: SM
authors.lastname: Kauzlarich
authors.forename: M B
authors.initials: MB
authors.lastname: Maple
authors.forename: R
authors.initials: R
authors.lastname: Movshovich
authors.forename: E D
authors.initials: ED
authors.lastname: Bauer
authors.forename: J D
authors.initials: JD
authors.lastname: Thompson
authors.forename: Z
authors.initials: Z
authors.lastname: Fisk